Engraving-machine.



G.'E. JOHNSON.

ENGHAVJNG MACHINE.

APPLICATION FILED NOV. is. me.

Patented Sept. 11, 1917.

4 SHEET$SHEET I.

G. E. JOHNSON.

' ENGRAVING MACHINE.

APPLICATION FILED NOV. 18. me.

Patented Sept. 11,1917.

4 SHEETS-SKIES! 2.

Law,

e. E. JOHNSON. ENGRAVING MACHINE.

APPLICATION FILED NOV- IB. 19l6.

Patented Sept. 11, 1917.

4 SHEETSSHEE.' s.

G. E. JOHNSON.

ENGRAVING MACHINE.

4 sums-sum 4 Patented Sept. 11, 1917.

FEET @Tdfi PATENT FFlfiE.

GUSTAF EDWARD JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO SANFORD S. VAUGHAN, OF OAK PARK, ILLINOIS.

ENGRAV'ING-MACI-IINE.

Specification of Letters Patent.

Patented Sept. 11, 1917'.

Application filed November 18, 1916. Serial No. 132,099.

To all whom it may concern:

Be it known that I, GUs'rAr EDWARD J OHN- SON, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Engravingivilachines, of which the following is a specification.

My invention relates to engraving ma chines and the like and has more particular reference to means therewith or therefor for holding in certain desired angular relations a pattern to be copied and material in which the pattern is to be reproduced.

The principal object of the invention is to increase the efliciency of such machines. A prime object is to enable profiling or recessing to be done on such machines automatically on angles heretofore impracticable in certain classes of work. It is also an ob ject to reduce the strain upon certain operative parts of such machines. A further obfleet is to provide an attachment for such machines whereby the efiicienoy thereof may be increased. A general. object is to provide a simple, strong and durable mechanism whereby profiling or recessing operations may be readily and easily donewithin a wider range of effectiveness than heretofore possible. Other objects and advantages will appear hereinafter.

In the accompanying drawings, which form a part of this specificatioml have illustrated these improvements with several modifications of details, and in connection with a well known form of engraving machine described as the Keller automatic profiler, although the invention is applicable to other forms of engraving machines, and it is to be understood that the illustration of the same in connection with one well known form of engraver is merely exemplary. Such machines are adapted to reproduce raised or sunken patterns. In the present illustrations the improvements are shown in die-sinking operations, although they are equally applicable to raised work.

In these drawings Figure 1 is a front eleration of such a Keller profiling machine with the present improvements, in a simple form thereof, attached thereto;

Fig. is an end elevation of the same machine with the present improvements there on, only the right hand end portions of the profiling 'machine being shown;

Fig. 3 is a similar end view, in fragment, showing a modification of some of the means constituting the present improvements;

Fig. 1 is a more fragmentary view showing in another operative position the improvements illustrated in Fig. 3;

Fig. 5 is an enlarged fragmentary view showing the two holders in section and their operative relation to the tracer and cutter respectively of the profiling machine, and showing how the bed plate of the machine is moved;

Figs. 6 and 7 are forms of a tracer and a cutter respectively for coarse or roughing out work;

Figs. 8 and 9 are respectively forms of a tracer and a cutter for finer cutting or finishing operations;

Fig. 10 is a face view of a die block having an impression of a claw hammer sunk therein;

Fig. 11 is a face view of a die block having two impressions therein, the impressions being that of the two halves of a pair of pliers;

Fig. 12 (Sheet 2) is a side view of one of the holders, for instance the pattern holder, the pattern being that of the claw hammer die shown clearly in Figs. 1, 5 and 10, the scale being that of Figs. 1 and '2;

Figs. 13 and 14 are fragmentary end views of the machine with the preferred form of these improvements thereon;

Figs. 15, 16 and 17 are fragmentary details of the holder tilting device shown in Figs. 13 and 14;

Fig. 18, Sheet 1, is a fragmentary vertical section showing how the tracer is impinged by an abrupt pattern wall in the older practice; and

Fig. 19 is a similar section, the bed plate having moved almost the length of a stroke from its position in Fig. 18.

In order fully to understand the present improvements it will not be necessary to describe the well known profiling machine itself in other than general terms. It is well understood that in this particular form of machine the bedplate 20 thereof moves up and down in suitable vertical guides, the length of its stroke being variable to suit the particular piece of work in hand. A motor 21 actuatcs a threaded shaft 22 retating in a threaded bearing 23 (Fig. 5-) carried by the bed plate 20, and an electric switch-operating device 24 (Fig. 1) reverses the direction of the motor from time to time, thus providing a reciprocating movement of the bed plate 20.

The swinging arm 25 is pivoted at two points 26, 26, upon a guide block 27 dovetailed upon the guide 28 carrying the screw shaft 29, which shaft may be operated automaticallyby the chain 30 and associated parts or manually by the wheel 39 so as to move the arm 25 laterally or on horizontal lines. The arm 25 carries a shaft 31 for a tracer and a shaft 32 for a cutter, a tracer 33 and a cutter 34 being secured to these respective shafts. For purposes of this description I am denominating as 25 the various. frame parts of the swinging arm carrying the tracer and cutter. The free end portions of this part 25 and the tracer and cutter carried by it constitute a unitary mechanism which is relatively fixed with respect to the up and down sliding motion of the bedplate 20 but which is movable in directions toward and from the bed plate on the pivots 26. A weight 35 on the cord 86, passing over pulleys 37 and 37 onthe frame of the machine, and secured to the arm 25, as at 38, tends to draw the tracer and the cutter constantly. toward the bed plate during the operation of the machine.- I11 viewing these parts as in Fig. 1 it will be understood that the pulley 37 is considerably farther from the observer than is the connection part 38. In the patent to Keller and lVarman, No. 956,769 of May 3, 1910, the weight90 and cord 91 are the equivalent of the-weight 35 and cord 36 of Fig. 1 of the present drawings.

The cutter is driven by a belt 40 operated I by a motor 41 and passing over apulley 42 on the shaft 32. In some instances the belt is, also carried over the pulley 42 whereby the tracer is also rotated, this being done usually only. in finishing cuts.

I will also; explain that the bed plate 20 is mounted so that it may be swung bodily on a vertical axis so that the vertical plane of, its. face mayv have various degrees of pitch, with respect to the axial lines of the cutter and tracer respectively. For this purposethe bolts 44, Fig. 2, are loosened slightly whereupon the bed plate. may he swung around one way or the other.

According to. the operation of this Keller automatic profiling machine without the present. improvements thereon. a pattern P to,be.reproduced (seenFigs 18 and 19 Sheet 1) is rigidly secured to the bed plate 20. whereby the tracer, as 33, will be engaged by. the surface of the pattern to be reproduced,-and a piece of material or work in which the pattern is to be reproduced is also secured rigidly to the bed plate in such position that the cutter 3st willengage it (also see Fig. 2 of the patent referred to). As the bed plate moves up anddown, the tracer, being constantly held yieldingly incontact with the pattern by a weight or weights, as 35 in Fig. 1 or as 90 in the patent referred to, and being relatively fixed with respect to the up and down motions of the bedplate, is forced ina direction away from, or is drawn toward, the bed plate according to the upand down contour of the pattern, and thus the cutter is simultaneously moved away from and toward the bed plate to a corresponding degree, thus reproducingthe configuration of the pattern in up and down lines. The machine is so constructed thatthe screw shaft 29 may be rotated a fraction of a turn with each stroke of the bed plate (see the patent referred to) wherebythe tracer and the cutter are moved horizontally by small steps until the entire pattern to be reproduced has been covered by the tracer. In other words, the screw shaft 29 and associated parts constitute the feeding device for the tracer andeutter. It moves the cutter and tracer to the right or left when viewing. the machine as 1n Fig. 1.

When. the tracer engages inclining pattern surfaces, as 45, Figs. 18 and 19, such in clining surfaces force the tracer, on one stroke of the bed plate, outward, or in a clirection away from the bed plate, and thus the point of the tracer 33 is made to follow the wall 45, and thus the cutter 34: reproduces the pattern wall 45 in the work WV.

7 In the operation of the machine dependence is had upon the angle of the pattern surface, as 45. against which the tracer impinges, in order to provide the out and in movement of the unitary mechanism which includes the frame 25, the tracer and the cutter. It will be noted from Figs. 6 and S that these tracers are themselves formed on tapering lines, which construction is essen tialto their required strength. The same is true ofthe cutters. It will be atonce apparentthat if such a tracer. should be met by an abruptwall, for instance in a groove having walls at right angles to the plane ofmovement of the bed plate, as the wall 46, Figs. 18 and 19, the pointof the tracer would not come to the corner of such right angled groove owing to the taper of the tracer, assuming, of course, that the work is now rigidly secured to .the bedplate, as is the practice where the present improvements are absent from the machine. Consequently the point of the tracer would not describe a right angle, if-it were forced out of the groove at all. It is probable that if the tapering shank of the tracer were impinged by such a wall, aslti, of the pattern and the lid taper of the tracer were of a sufficient number of degrees the tracer would be forced outward, but thus a tapering wall, as 46*, instead of a right angled wall 'would be formed in the material being cut. However, as it is practically essential that the point of the tracer and the point of the cutter engage the pattern and material respectively, the pattern heretofore has invariably been provided with upper and lower walls of such taper or incline as will engage the point of the tracer and force it in a direction away from the bed plate on one bed plate stroke.

It is claimed for the machine that it will reproduce a pattern by the up and down movement of the bed plate where the angle of the surface such as so, Fig. 18, impinging the point of the tracer is less than ten de grees greater than a right angle, but in practice on most work it is believed an angle of fifteen degrees is more nearly the minimum.

It is also apparent that the tracer is subjected to great strain by being engaged by walls of a limited incline.

The eiiiciency of the machine as heretofore known is therefore limited to the reproduction of designs having walls or surfaces adapted to impinge against the tracer and being at a material angle to the aXial line of the tracer as viewed in cross section, as in Figs. 18 and 19. In many instances, however, it is desired to reproduce a pattern having side walls at right angles, as at 46, Fig. 18, or even less than a right angle with respect to such perpendicular line, and the present improvements are provided, among other features, to secure such advantageous results. It is also pointed out that in certain classes of work the recess which it is desired to reproduce is quite deep and at the same time narrow, calling for a short stroke of the bed plate, in which class of cases the present improvements are peculiarly advantageous, as will hereinafter more fully appear.

With this general understanding of the profiling machine itself and its limitations, the application and advantages of the pres ent improvements will readily be understood. These improvements consist broadly in means for holding the pattern and the material in such a way that the same may be turned or tilted into various positions adapted to the successful reproduction of patterns outside the scope of the illustrated machine or other machines as heretofore known, means whereby this rocking or tilt ing is done automatically during the engraving operation; the means including in one aspect provisions for a continuous rocking motion, that is, one way and then the other continuously, or, in another aspect, whereby a tilting motion may be given to the pattern and material simultaneously in one direction with a period of rest thereafter at predetermined portions of the stroke of the bed plate, the means including, in another regard, the feature of holding the work and the pattern rigidly in a given tilted position for certain kinds of operations.

The preferred form of these improvements is shown in Figs. 13 to 17, that form being preferred because of its inclusion of more features of advantage than any of the other forms shown. In the several forms the feature of the pivoted holders with connecting links in parallelogram arrangement is the same, and I will first describe this structure common to all of the larger figures. This parallelogramstructure is a preferred embodiment of the feature of unitary means for simultaneously and equally rocking or tilting the pattern and material to be cut. Like parts are given like reference characters throughout the several modifications and views.

Referring to Fig. 12, (Sheet 2) and Fig. 5 (Sheet 3) the preferred form of holder for both the pattern and the material comprises first a pair of standards or supports 50 secured by cap screws to the bed plate 20. At equal distances outwardly from the bed plate these standards 50 are apertured to receive the trunnion shafts 51, these shafts being rigidly secured to the substantially U-shaped holder 52 in the leg portions thereof, as by a through pin 58.

The two holders 52 are thus mounted in the brackets or supports 50 so as to rock or tilt therein. At each side of the holders 52 is a bar bolted to the holder, as at 55, and set screws 56 are provided in the bar 54: whereby the pattern 57 or material 57 may be rigidly clamped therein. The holders 52 are preferably U-shaped, as shown, so that the surfaces of the pattern engaging the tracer and of the material engaging the cutter may be in and about the axial line of the trunnion shafts 51. In Fig. 5 I have shown a spacing bar between the rest surfaces of the holder and the pattern or material 57 or 57 respectively, showing how the pattern and work may readily be adjusted in this respect.

()n the trunnion shafts 51 extending from one side of each of the holders I rigidly secure, as by a key, the lever bars 60 and 61, and these bars preferably extend on both sides of the axis of the holders. Between. the corresponding levers of the lever bars 60 and 61 I provide the connecting rods 62 and 63, the ends thereof being pivotally mounted at corresponding points on the levers equally spaced from the axes of the holders respecf tively. llhese connecting rods are so formed that they may be shortened or lengthened whereby an exact parallelogram may be produced with the pivotal center. at the end portions of these connecting rods as the HOW four corner points of such parallelogram. To this end I form right hand threads atone end of each connecting rod and left hand threads at the other end thereof, the ends of the rods respectively beingthreaded into the yoke connections 65 (Fig. 2), a nut 66 at one end of each of the rods binding each rod against turning, thus maintaining the desired adjustment. It will thus be apparentfthat if one of the holders-52 is turnedior rocked into any angular position on its. trunnions 51 the other holder will be turned or rocked in the same direction and to the same extent.

In someuses ofathe device it is not necessary to vary intermittently the angular relationof the pattern 57 or material 57 to the spindle and cutter respectively, while it is important to tiltthe pattern and material into sgme angular relation onv a. horizontal axisbeforebeginning the engraving operation. In order to hold and maintain positively the two holders in any desired position on the trunnions 51 within the limits of their tilting or rocking movement I provide the; arcuate slotted locking member 7 0 integral with each of the levers 60 and 61, a cap screw 71 threaded into the bed plate 20 and passing through the slot 72 being adapted to hold these levers andconsequently the holders in any such desired relative position. When .the device is used with a continuous or interrupted rocking motion the cap screws 71 are retracted slightly whereupon the holders may move freely on their respective trunnions.

A simple form of means for providing a continuous rocking motion to the holders 52 is shown in Figs. 1 and 2 andcomprises a supporting frame 75 rigidly secured, as at 7 6, 7 6, to the part of the machine carrying the bed plate 20. This part of the machine, which I will indicate at 7 7 77 moves with the bed plate in its arcuate movement on a vertical axis when the bolts 44 are loosened and the bed plate is swung around one way or the other, as hereinabove mentioned. By securing the frame 75 to this relatively movable part carrying the bed plate it will be apparent that the present improvements are-equally operative in any practical angular position of the bed plate 20, such angular position beingunderstood to be obtained by turning the bed plate on :zvertical axis. I he frame or support 75 is relatively fixed, howpasses loosely. thelinkconnection-78', a set screw 81 being adapted to hold the linkconnection, 78 and 7 9, rigidlytogether. From such construction itwill be clear that as the bed plate 20 moves up and: down the two holders 52v will be rocked simultaneously one way andthen the other.. 7

By reason of the adjustabilityiof' the'link connection 7879 the operator is-enabled to adjust, the two holders with the levers 60 and 61 substantially horizontal and with the tracer and cutter substantially on the me-. dian line of the pattern and material re-- spectively between the upper and lower limits thereof. Preferably. the axis of the tracer and thatof the cutterpass respectively substantially through the axes of.- theholders, and also through the medial horizontal line ofthe pattern and material respectively when setting the parts to .begin operations- WVhen the pattern and material are.

This adjustability-ofz the connection 7 8-7 9- has the further important function. of ena':-

bling a double die, such as shown inFig. 11, for instance, to be cut wlthoutz changing the setting of the pattern or: the materialin-the respective holders. Thus on completing one of the two patterns shownin Fig: 11-the set screw, 81 may be loosened, the'bed plate 2()* shifted so that the tracerwill be substantially at. the median horizontal line of the second pattern, whereupon the throw of the bed plate may be adjusted, the nut 81 tightened, and the engraving operation continued as before. WVhen the holders-are held firmly in a desiredtilted positionby tightening one or both of, thescrews 71; the set screw 81- is simply retracted and'the locking piece =slides freely uponthe'link connection 78.

It-will be noted 'thatthe lever arm 60 has a plurality of holes83 for. the connection 79 and that the horizontal armof thesuppor-t 7 5 has a plurality of holes 84 for the connection 78. If the link connectionv 7S79 is shifted closer to or fartherfroma vertical line through the trnnnionaxis 51 it will be apparent that a. greater or less degree of rocking movement. will be imparted to the holders during a given throw of the bed plate. Insome classes of workthe rocking of these holders should be considerable while in otl1encl-assesit may be very much less.

From Fig. .2v ltwill be seen that I provide a, counterweight 88 on an. extension. ofv the lever 61. This-counterweight maintains the V holders tightly against the'parts which offer resistance to the downward movementof the weight 88, taking up any slight lostmotion in the connections, and relieving strain upon the parts due to impingement. of the pattern upon the tracer. A similar counterweight may be applied directly. toione of the holders,.

ofl the axis thereof, as at 89, Fig. 1, merely a ring secured to the holder and a small piece of the'cord being shown. The cord of such a counterweight would pass, of course, over a fixed pulley or pulleys, or be secured to a lever, as in the case of the bed plate counterweight shown in Fig. 1.

From the construction of these improvements thus far described it will be apparent that as the tracer is engaged by surfaces on the pattern the pattern is turned so that a wall which would normally be at right angles or even less than a right angle to the surface of the bed plate and in a vertical plane through the tracer point is now at such an angle that the tracer easily rides upon it, forcing the tracer and. cutter out- Ward, whereby the cutter duplicates such normally abrupt walls, and all without undue strain upon any of the parts.

1 will now describe a modification of parts providing for tilting the holders at a predetermined portion of the bed plate stroke and thereafter maintaining the holders in a relatively fixed position with respect to the tracer and cutter during the continuance of that stroke. lVhcre the surface to be cut is of considerable length in an up and down direction or where the walls to be reproduced are deep, that is in directions toward and way from the bed plate, as, for instance, a recess having deep side walls and a short bottom wall, it is preferable not to continue the rocking movement of the holders beyond such as will provide the desired angularity of a wall or walls therein to be reproduced. Referring to Figs. 3 and 1, a bar 90 is ad justably secured rigid with the support 75, which support is extended outward also at the bottom, as by the branch 75, the bar 90 being also adjustably secured rigidly as by a bolt to this extension. A groove 91, having a bond 92 is cut in this bar and the lever arm is provided with. a roller at 93 adapted to travel in the groove 91, 92. The parallelogram arrangement and mounting of the holders is the same as in Figs. 1 and 2. When the holders are in their relative positions as shown by the fulllines of Fig. 1

the roller at 93 is in the bend of the groove 92, where it is held until the bed plate 20 has moved to some extent up or down, the holders being tilted by the difference in elevation between the horizontal plane of the roller 93 and that of the axis of the trunnion 51. After being thus tilted, if the bed plate continues its stroke the roller, at 93, will be drawn into one or the other ofthe straight portions of the groove 91, and the angular position of the holders will be maintained to the end of the stroke. Onthe return stroke the same angular position will be maintained until the roller comes to the bend 92 when the holders will again gradu- G5 ally assume their position shown in Fig. 4:,

relative positions.

and if the stroke be continued the holders will be tilted in the reverse direction and so maintained to the end of the stroke. The adjustability of the bar 90 in an up and down direction provides for preliminarily adjusting the holders into their non-tilted position shown in Fig. 1 in which position thetracor is preferably substantially on the medial horizontal line of the pattern, and it also provides for obtaining the same adjustment for each of two patterns on a single die block, .such, for instance, as shown in Fig. 11. Referring now to Figs. 13 to 17 showing the preferred means for rocking the holders on their respective axes, a bell crank lever 100 is pivotally mounted, as at 101, upon the frame or support 75.

The upper leg of this bell crank 100 has adjusting holes 102 corresponding with the adjusting holes 83 in the lever 60 whereby the link connection 7 87 9 may be adjusted to provide various degrees of rocking movement to the holders 52. The support is rigidly secured upon the bed plate frame 77 (which is that part which is adapted to swing on a vertical axis through the loosening of the bolts 14:, as hereinabove described, but which is relatively fixed with respect to the up and down movement of the bed plate 20). Upon the bed plate 20 I provide the bracket 103 secured as by bolts and having the slot 103 therein. Upon this bracket 103 is secured the cam device 104, which has a slot 105, in which slot travels the roller 106, which roller is secured upon the bell crank 100. In Fig. 13 the parts are shown in their preferred relative positions for beginning operations, wherein the tracer is on a substantially medial horizontal line of the pattern.

WVhen. inthis position it will be noted that the roller 106 is substantially midway of the middle portion of the groove 105. Since the cam device 104 is held rigidly upon the bracket 103 by the nut 108 it is obvious that as the bed plate 20 moves up or down the roller 106 traveling in the slanting cam track will be forced in a horizontal. direction to the right or left as viewed in the drawings, carrying with it the depending arm of the bell crank 100 and tilting the holders 52 through the link connection 78--79 and the parallelogram holder connections hereinabove described. This tilt ing movement will continue so long as the roller 106 is in the central or diagonal portion of the slot 105, but when the roller comes to one or the other of the bends in the slot 105 the tilting motion will cease and thereafter to the end of the stroke the holders will be maintained in their then tilted In other words, the tilted position of the holders shown in Fig. 14. will be constant so long as the roller at 106 travels in the leg of the cam device in which it is there shown. Onthe reverse strokewhile the roller is travelingthrough the diagonal central portion of the cam track 105 the holders will be gradually tilted in the reverse direction and subsequently maintained for a predetermined period when the roller is traveling in the other leg of the cam device. This action may be more clearly understood when-it is considered that the bell crank 100 controls the tilting action of the holders; that as the holdersmove upward or downward bodily they are bound to tilt unless there be a suitablegiving-way or yielding of the horizontal leg of thebell crank 100 to compensate for such upward or downward movement; that under such suitable giving-way of the upper leg of the bell crank 100the roller 106 on the perpendicular leg of the bell crank 100must movelaterally and thecam track must provide for such lateral movement'; and that sincethe bed plate carryingthe cam 104E moves upward and downward the; camtrack must also provide for such upward and downward movement. The cam track is therefore on lines which are the diagonals or resultants respectively of the two necessary movements of the roller 10el-, namely sidewise and up or down. It is pointed out that the cam 104: may be variously designed to provide various degreesand periods of tilting action and the maintenance for various periods of the holders in such positions, as well as to provide various other kinds of tilting action. In practice a cam for any desired action may readily be plotted by simple 'rulesof mechanical drawing; or it a blank plate be substituted for thecam 104 on'the machine the various points of the desired cam track can be marked thereon by positioningthe holders as desiredat the various elevations of the same within the throw of the bed plate and noting thevarious positions of the roller 10 6. The cam device 104 may be turned adjustably 011 its own axis, namely onthe threaded stud 107, by loosening thenut 108, whereby the slant of the central portion of the cam track 105 from the horizontal maybe increased or. lessened and the period of rocking movement given to the holders may thereby be increased or d-imii'iished, according to'the work in hand.

The adjustability of the cam devicei'n an up and down direction in the slot 103 of the bracket 103 provides for positioning the cam device in proper relation to the holders and tracer so that the-tiltor rock of the holders will be as desired, and also provides for such adjustments one after the other when a single pattern block contains two or more-patterns, for instance as shown in Fig. 11.

It will be noted that the bell crank 100 has a hole 109 andthat there isa registering hole 110 in the support 7 5, If a pin should be inserted in these holes 109 and 110' when the parts are in the relative position shownin Fig. 13, it is evident that the bell crank 100 would be locked in that rela tive position. It now the roller 106 be takenofi', or. if the nut 108 be sufiiciently loosened it is evident that the bed plate 20 may move-up and down without hindrance from these parts. With the parts so arranged? a continuous back and forth tilting motion is givento the holders 52, the same as in Figs. land 2, the cam feature associated Withthe bell. crank 100 notbeingoperative at such time.

While I have illustrated and described preferred means for holding a pattern and material inoperative association with the tracer and cutter of such machines, and preferred means for tilting 0rrocking them simultaneously, both continuously and with intervening rest. periods, and have shown a modificationof means whereby the holders may be rocked or tilted with a period of non-rotation at predetermined portions of the stroke, including preferred means for adjusting various parts, as well as a preferred mechanical construction of these various parts, it will be apparent; that departuresmay-be made from what. has been specifically illustrated and described, all withinthe spirit of the invention and withinthegeneral principlesof operation, and I contemplateas. included in the presentinvention all such changes and modifications as fall. within the scope of the appended claims.

I claim:

1. In a machine of the character described having a reciprocating. part, with means for reciprocating'the same continuously during theoperation. of the machine, and a part relatively fixed with respectto the direction of movement ofsaid other part, one of said partsha'ving a tracer anda cutter, the other of saidparts being adapted for carrying a pattern to be engaged by said tracer and material to be cut by said-cutter, the combination therewith of a holder for suclrpattern and a holder for such material, each of said holders being mounted to rock into various positions relative tov said tracer and said cutter respectively, each of said holders being secured to one of saidparts whereby there is relative movement between said holders bodily and the other one of said parts, means under the control of a movable part of the machine for simultaneously rocking each of said holders into various relative positions ontheir axes respectively, and means for: rigidly: securing said holders in various positions on their own axes respectively within the limits of their respective rocking-motions. r

2; In a machine ofthe character described having a reciprocating part, with means for reciprocating the same continuously during the operation of the machine, and a part relatively fixed with respect to the direction of movement of said other part, the movement of said reciprocating part being the cutting stroke movement of the machine, one of said parts having a tracer and a cutter, the other of said parts being adapted for carrying a pattern to be engaged by said tracer and material to be cut by said cutter, the combination therewith of a holder for such pattern and a holder for such material, each of said holders being mounted to rock into various positions relative to said tracer and said cutter respectively and relative to the stroke movement of said reciprocating part, each of said holders being secured to one of said parts whereby there is relative movement between said holders bodily and the other one of said parts, and means including a connection between a relatively fixed part and a relatively movable part for simultaneously and said cutter being relatively fixed with,

respect to the sliding movement of said bed plate, means for moving said tracer and said cutter yieldingly toward said bed plate, a holder for a pattern pivotally moun ted on said bed plate to move bodily therewith in operative position between said tracer and said bed plate, a holder for material to be operated upon pivotally mounted on said bed plate to move bodily therewith between said cutter and said bed plate, and means for simultaneously automatically rocking said two holders equally and with'the same relative movement when said bed plate moves back and forth relative to said tracer and said cutter.

4. In combination, a plurality of pairs of supports adapted to be secured to an engraving machine of the character described in association with the tracer and cutter thereof, a substantially U-shaped holder having bearings and pivotally mounted in each pair of said supports at points on the leg portions respectively of said U-shaped holders, the axis of said pivotal mountings of the two holders being substantially parallel, said holders being spaced apart, means including a link connection between said two holders, the end portions of said link connection being spaced equally from said two axes and on the same side thereof whereby a tilting movement given to one of said holders is communicated equally to the other thereof, and means connected to said holders and to a part of said engraving machine or the like for tilting said holders during the operation of the machine.

5. In a machine of the character described having a relatively movable part and a part relatively fixed with respect to the direction of movement of said other part, one of said parts having a tracer and a cutter, the other of said parts being adapted to carry a pat tern to be engaged my said tracer and material to be cut by said cutter, the combination therewith of a holder for such pattern and a holder for such material, each of said holders being secured to one of said parts whereby there is relative movement between said holders bodily and the other one of said parts, each of said holders being mounted to tilt, and means for tilting said holders equally to a given extent during a portion of the relative movement between said two parts and. thereafter maintaining said holders in substantially the same tilted relative position during the remainder of the rela tive movement between said two parts in the ers icing secured to one of said parts whereby there is relative movement between said holders bodily and the other one of said parts, each of said holders being mounted to rock, and means for rocking said holders simultaneously in the same direction into a tilted position and tl en maintaining them in substantially the same degree of tilt for a predetermined period during a portion of the reciprocatory movement between said two parts.

7. In a machine of the character described having a relatively movable part with a reciprocatory movement and a part relatively fixed with respect to the directions oi movement of said other part, one of said parts having a tracer and a cutter, thd other of said parts being adapted to carry a pattern to be engaged by said tracer and material to be cut by said cutter, the combination therewith of a holder for such pattern and a holder ttor such material, each of said holders being secured to one of said parts where by tllGI'GlS relative reciprocatory movement between said holders bodily and the other and cutter to provide a feed motionthereof,

a bed plate mounted to have a 'reciprocatory motion substantially at right angles to the feed motion whereby a cutting stroke is provided relative to said tracer and said outter, means for reciprocating the bed plate continuously during the operation of the machine to provide a cutting stroke, holding means carried-by said bed plate fo'rholding a pattern to be engaged by said tracer and material to be engaged by said cutter, said holding means being mounted to move into various'angular positions with respect'to the direction of the cutting stroke motion of said bed plate while being carried bodily with the bed plate, and means for periodically auto matically moving said holding means into such relative angular positions during the cutting stroke'movement of said bed plate.

9. In a machine of the character described, the combination of a part having a reciprocatory cutting stroke motion with means for reciprocating the same continuously during the operation of the machine, a part relatively fixed with respect to the recip'rocatory motion of said other part, means providing a feed motion for one of said parts, one of said parts carrying a tracer and cutter, one of said parts being movable bodily in directions toward and from theother of said part, means on one of said parts for holding bodily thereon a pattern tobe engaged by said tracer and material to be engaged by said cutter, said holding means being mounted to tilt relative to the part bodily holding the same, and means for automatically tilting said holding means relative to the part bodily holding the same whereby a pattern and such material held thereby will be simultaneously tilted in the same direction during the operation of the machine.

10. In a machine of the character described, the combination of a part having a reciprocatory cutting stroke motion, a part relatively fixed with respect to the reciprocatory motion'of said other part, one of said parts carrying a tracer and a cutter, one of said parts being movable bodily in directions toward and from the other of said parts, means on one of said parts for holding 'a pattern to be-engaged by said tracer and materi'al to beengaged by saidcutter, said holding means being'mounted to tilt, and means for automaticallytilting said holding means to aapr'edetermined degree during acportion of a stroke'of said reciprocatory part and thereafter maintaining said holding means insuchtilted position during the remainder of thestrokeof said reciprocatory part.

11. In a machine of the character described, thccombination of a part having a 'reciprocatory cutting stroke motion, a part relatively fixed with respect to the reciprocatory motion of said other part, one of a tracer relatively fixed with respect to the reciprocatory movement of said reciprocatory part, a holder pivotally mounted to rock on said reciprocatory part and in association with said tracer, and means for automatically rocking said holder during the operation-of the machine.

13. In combination, a movable part adapted to provide back and forth cutting strokes, a;holder for a pattern and a holder for material to be cut *tiltalo'ly mounted and carried by said movable part, a tracer adapted to engage a pattern when in the pattern holder, a cutter adapted to engage material when in the material holder, means for holding'the tracer and cutter yieldingly in engagement with the pattern and material respectively when so positioned, said tracer and cutter being relatively fixed with respect to the back and forth movement "of said movable part,'and means for automatically tilting said holders bodily upon said movable part simultaneously at predetermined intervals during the operation of the machine.

14. In a machine of the character described, the combination of a part having a back and forth motion, a part relatively fixed with respect to the back and forth motion of said other part, one of said parts carrying a tracer and a cutter, one of said parts being movable bodily in directions toward and from the other of said parts, means for forcing said parts yieldingly toward each other, means on one of said parts for holding a pattern to be engaged by said tracer and material to berengaged by said cutter, said holding means being mounted to tilt, and means for automatically tilting said holding means to a predeter mined degree during a portion of the stroke of said part having the back and forth motion. a

15. An attachment for an engraving machine having a part with a. back and forth movement and a tracer and a cutter operatively associated therewith, said attachment,

comprising in combination a holder for a pattern and a holder for material, each being adapted to be secured to the machine part-having the back and forth movement and being mounted to rock thereon when so secured, means connecting said holders whereby when one is rocked the other is simultaneously rocked in the same direction, and means secured to a relatively fixed part of the machine and secured to one of said holders forrocking said holders when the attachment is inoperative position and the machine is in use.

16. In a machine having a relatively movable part providing a cutting stroke, a pattern holder and a work holder mounted to rock thereon, and a tracer and a cutter operatively associated with said holders respectively, the combination therewith of means for automatically rocking said holders simultaneously on said movable part during the movement of said movable part, said means comprising a lever on each holder, a connecting rod between the two levers, a support secured to a relatively fixed part of the machine, and a connection between said support and one of the levers on said holders.

17. In a machine having a relatively movable part providing a cut-ting stroke, a pattern holder and a work holder mounted to rock thereon, and atracer and a cutter operatively associated with said pattern and work holders respectively, the combination therewith of a lever on one of said holders, a cam operatively associated with a relatively fixed part'of the machine, a lever operatively associated with said cam, a connection between said two levers, said cam, lever and connection means being adapted to tilt the holder having the lever thereon during a predetermined portion of the movement of said movable part and thereafter maintain said holder in a substantially fixed relation with respect to said movable part during a succeeding portion of the movement of said movable part, and means for communicating the tilting motion from one of said holders to the other thereof.

18. In an engraving machine having a tracer and a cutter operatively pressing yieldingly against a pattern and material respectively, the machine having a stroke movement whereby the tracer rides back and forth upon the pattern and the cutter rides back and forth upon the material,the machine being such that when thetracer engages an abruptwall in the pattern dependence is had upon the angle of such wall where engaged by the tracer to cause the tracer to ride upon such wall and thereby carry the cutterso as to define such abrupt wall in the material being cut, the combination therewith of means under the control of the machine for automatically varying simultaneously the relative'position of the pattern and material to the tracer and cutter respectively during the operation of the machine whereby such abrupt wall in the pattern is positioned at such an angle to the tracer that the tracer may readily ride upon the same.

19. In an engraving machine having a tracer and a cutter operatively pressing yieldingly against a pattern and material respectively, the machine having a stroke movement whereby the tracer rides back and forth upon the pattern and the cutter rides back and forth upon the material, the machine being such that when the tracer engages an abrupt wall in the pattern dependence is had upon the angle of such Wall where engaged by the tracer to cause the tracer to ride upon such wall and thereby carry the cutter so as to define such abrupt wall in the material being cut, the combination therewith of means under the control of the machine for automatically varying simultaneously therelative position of the pattern and material to the tracer and cutter respectively during a period of the operation of the machine whereby such abrupt wall in the pattern is positioned at such an angle to the tracer that the tracer may readily ride upon the same, said means thereupon maintaining such relative position of the pattern and material respectively during a further period of the operation of the machine.

20. In a machine of the character described having a reciprocatory part, with means for reciprocating the same continuously during the operation of the machine, and a part relatively fixed with respect to the direction of movement of said other part, the movement of said reciprocating part being the cutting stroke movement of the machine, one of said parts having a tracer and a cutter, the other of said parts being adapted for carrying a pattern to be engaged by said tracer and material to be cut by said cutter, the combination therewith of a holder for such pattern and a holder for such material, each of said holders being mounted to rock into various positions relative to said tracer and said cutter respectively and relative to the stroke movement of said reciprocating part, each of said holders being secured to one of said parts whereby there is relative movement between said holders bodily and the other one ofsaid parts, and means including a connection beforth in the same directions during the operation of the machine, said connection he- Gdiaies of this patent may be obtained for ing in operative, relation .to said holders and being adjustable as to" itsaehg'm whereby the holders may he adjiistedas to their posi .10 tion relative to each other, When the machine is at rest.

GUSTAF EDWARD JOHNSON.

ve cents each, addressing the Fbxhxhisiohr of Patents. Washington, D. O. i 

